Soil profile

Hello,
If anyone knows, or is, an expert in Zimbabwean or South African
soil profiles (e.g. pH, soil chemistry, soil nutrients, humidity
aeration, etc...) and tree species that may grow well in such areas, or
knows of a place that I can get such information, please let me know
where or who.
Thank you very much,
Pano
e-mail: pano at micro.org